See this dialog response. To summarize, the deuterium nucleus is antisymmetric in terms of isospin, and has spin 1 and even (+1) parity. What came before?
Phone call: -- What is the difference between deuteron and deuterium? -- Therefore, the quantum state of the deuterium is a superposition (a linear combination) of the , state and the , state, even though the first component is much bigger. -- Are there any other interesting aspects about this article? -- Since the total angular momentum "j" is also a good quantum number (it is a constant in time), both components must have the same "j", and therefore . -- What is the spin? -- This is the total spin of the deuterium nucleus. -- What about the isospin? -- 